An internal coil gives the wort greater surface area for contact with the cold water. This reduces the amount of water needed to cool the wort! The wort runs through one tube, while the cold water runs through another tube allowing for the shortest possible cool off times. Comes with a garden hose fitting for the water in, and a 1/2" NPT for the water out. Compatible with our 1/2" ID tubing for wort connections.